Abstract
Surface modification can effectively improve the ability of hydrochar to capture pollutants from wastewater. In this work, polyaminophosphonated-functionalized hydrochar (PAP-HC) was successfully synthesized by a chemical grafting approach and applied efficiently to adsorb aqueous Pb(II). Properties of PAP-HC were characterized by ICP, FTIR, XPS, SEM–EDS, elemental analysis, zeta potential, and BET. The Pb(II) adsorbing behavior of PAP-HC was tested by batch adsorbing assays, including the pH impact, uptake kinetics, sorption isotherms, sorption thermodynamics, and PAP-HC recycling. Sorption isotherms were better illustrated by a Langmuir equation, while the kinetic profile was modeled by a pseudo-second-order equation. Adsorption of Pb(II) onto PAP-HC mainly relied on chelating Pb(II) with aminophosphonate groups of PAP-HC by XPS and FTIR analyses. The actual adsorbed amount of PAP-HC maximized to 179.92 mg·g−1 at 298 K, which showed high adsorption ability. Nitric acid and hydroxide solutions were suitable for desorption of adsorbed Pb(II) and activated PAP-HC, respectively. PAP-HC can be reused for at least five cycles without obvious change in adsorption performance. The results suggest PAP-HC is a prospective adsorbent to capture Pb(II) from wastewater.
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The datasets used and analyzed during the current study are available from the corresponding author on reasonable request.
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This study was supported by the National Natural Science Foundation of China (No. U1932126 and 12175200).
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Bing Li: methodology and supervision. Jia-Lin Liu: experiments and writing. Huan Xu: data analysis, editing, and writing.
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Li, B., Liu, JL. & Xu, H. Synthesis of polyaminophosphonated-functionalized hydrochar for efficient sorption of Pb(II). Environ Sci Pollut Res 29, 49808–49815 (2022). https://doi.org/10.1007/s11356-022-19350-4
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DOI: https://doi.org/10.1007/s11356-022-19350-4